package test

object HelloWorld {
  def main(args: Array[String]): Unit = {
    println("hello,scala");
    var a = 100;
    println(a);
    val b = 200;
    println(b);
    a = 4000;
    println(a);
    //b=500;//error
    var st:String="abcchina"
    println(st);
    type T=String
    var s2:T="老刘"
    print(s2)
  }
}
